| 摘要 |
A modified glucose dehydrogenase is disclosed which comprises a water-soluble glucose dehydrogenase having a pyrroloquinoline quinone as a coenzyme. At least one amino acid residue present on the surface of the water-soluble glucose dehydrogenase is replaced with arginine. The side chain of the amino acid residue is exposed at the surface of the molecule and is not expected to substantially interact with other residues. The amino acid residue is present in a region that is probably not an enzyme active site or a substrate binding site. Preferably the amino acid residue is selected from the group consisting of glutamine, asparagine, and threonine. This modified enzyme can be prepared by recombinant processes and recovered efficiently.
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